EP 1333592 A1 20030806 - Method for estimating Echo Return Loss in a communication Link
Title (en)
Method for estimating Echo Return Loss in a communication Link
Title (de)
Verfahren zur Bestimmung der Echodämpfung bei einer Kommunikationverbindung
Title (fr)
Méthode pour déterminer l'affaiblissement de retour d'écho dans une liason de communication
Publication
Application
Priority
US 2966901 A 20011231
Abstract (en)
A method of estimating an echo return loss of a communication link measures the peak power value of a signal received from a far end of a communication link and the corresponding peak power value of a signal received from the near end of the communication link. When the near end signal is free from near end voice and excessive noise, the near end corresponding peak will be the echo of the far end power. The far end power is monitored and when a peak is detected, a period, which can be equal to a filter length period, is initiated. When the period has run, the delay line attached to the near end is polled to determine the peak power in the delay line. This peak power will correspond to the far end peak. If a peak, exceeding the first peak is detected before the period has run, the period is reinitiated. The echo return loss estimate is calculated as a ratio of the far-end peak power value to the near-end peak power value. The measured far-end signal is the payload information that the communication link was established to convey and the measured near-end signal is the echo of the payload.
IPC 1-7
IPC 8 full level
H04B 3/46 (2006.01)
CPC (source: EP US)
H04B 3/493 (2015.01 - EP US)
Citation (search report)
- [X] EP 0963057 A2 19991208 - CIT ALCATEL [FR]
- [A] US 4349707 A 19820914 - PERRIGAULT CLAUDE, et al
- [A] GAENSLER T ET AL: "NONINTRUSIVE MEASUREMENTS OF THE TELEPHONE CHANNEL", IEEE TRANSACTIONS ON COMMUNICATIONS, IEEE INC. NEW YORK, US, vol. 47, no. 1, January 1999 (1999-01-01), pages 158 - 167, XP000802438, ISSN: 0090-6778
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 2003123399 A1 20030703; US 6952472 B2 20051004; DE 60231699 D1 20090507; EP 1333592 A1 20030806; EP 1333592 B1 20090325
DOCDB simple family (application)
US 2966901 A 20011231; DE 60231699 T 20021223; EP 02102878 A 20021223